Cliff's Quadrajet Parts and Rebuild Kits
General Category => Quadrajet Carb Talk and Tips => Topic started by: Silver 7T8 on January 28, 2016, 03:07:01 PM
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Hello All,
My first Cliff's HP Post -
Looking for Q-Jet advice - choosing between two Q-Jet Models listed below.
I have a 1978 Corvette with the following modified small block.
374 CI (4.125" Bore x 3.50" Stroke)
9.4 to 1 Compression
180cc AFR Cylinder Heads
218* Intake / 228* Exhaust (112* LC) GM Hot Cam
15" Hg @ 800 RPM Idle Speed with OEM L-48 Q-Jet 17058204
I plan on setting up one of the two following carbs. to Recipe #-2 in Cliff's Book.
OEM Q-Jet 17058204 (Large Air Bleeds .120" Main Jet will need to be reduced)
Edelbrock # 1904 Almost new condition (Maybe less work vs. OEM carb.?)
Note: This car has a 5-Speed Manual Overdrive Transmission, thus low speed
overdrive RPM (1500 to 2000 RPM ) is an important performance objective.
Any guidance and assistance will be greatly appreciated choosing the best carburetor.
Thank You
Larry ( Silver 7T8 )
Seattle Area
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The end result with either one would be the same. I'd lean toward the factory carburetor as it is a perfect fit everyplace. The Edelbrock has a very slight advantage with the single MAB casting, but that disappears when you correctly calibrate the original carburetor for what you are doing.
I would get one of our kits, and we can supply tuning parts for exactly what you are doing. I'd also get one of our HP choke pull-offs, so the secondaries don't lag, and consider an E-choke conversion if the intake has been changed or heat crossovers blocked off, or if the stock hot air parts aren't in perfect working order......Cliff